diff --git a/thrift.vim b/thrift.vim
index d4f509c..d95524e 100644
--- a/thrift.vim
+++ b/thrift.vim
@@ -31,7 +31,7 @@
 
 " Keywords
 syn keyword thriftKeyword namespace
-syn keyword thriftKeyword php_namespace ruby_namespace perl_package
+syn keyword thriftKeyword php_namespace perl_package
 syn keyword thriftKeyword xsd_all xsd_optional xsd_nillable xsd_namespace xsd_attrs
 syn keyword thriftKeyword include cpp_include cpp_type const optional required
 syn keyword thriftBasicTypes void bool byte i16 i32 i64 double string binary